Rheem RS120-64BP Use & Care Manual page 23

4.11.4 Mix the Dowfrost HD propylene glycol and
tank make sure that all the components are
distilled water mixture in accordance with Table 4
accessible and easy to reach. Provide for clear
and Table 5 in a large clean bucket. You will need a
access to the storage tank, pump, expansion
second empty bucket as well. The charging process
tank, mixing valve, time clock and other key com-
also will require a low flow diaphragm pump (Flojet
ponents. If a component in the potable water
or equal) to fill and pressurize the collector loop.
side of the system may require future service or
maintenance make the connections with brass
unions. Use only brass nipples and unions and
copper and brass fittings in plumbing the solar
DOUBLE TANK SYSTEM SCHEMATIC
Connect the discharge side of the pressure pump
storage tank and expansion tank. The use of gal-
to the upper charge faucet (No. 9) Place the pump
vanized fittings or nipples, di-electric unions,
suction side hose in the glycol solution. Close the
CPVC, PVC or other plastic pipe is prohibited.
isolation ball valve (No. 10) and connect a second
hose to the lower charge faucet (No. 11). Place the Hard copper connections to the city cold water
other end of the hose in the empty bucket. supply line and the home hot water feed lines are
recommended. The gaskets in standard water
heater flex hose connectors can become brittle
and compressed over time and begin leaking on
the water heater. If not detected in a timely
fig.17
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